Operating Systems Design and Implementation, Third Edition phần 4 docx

... key, 2 for the "1'', and so on. Each key is assigned a number, including modifier keys like the left SHIFT and right SHIFT keys, numbers 42 and 54. When a key is pressed, MINIX 3 ... w_timeout line 13 046 is called. What needs to be done depends on the current command in w_command. The timeout might have been left over from a previous operation, and w_command may have...

Ngày tải lên: 12/08/2014, 22:21

... class="v1" height="17">Index Operating Systems Design and Implementation, Third Edition By Andrew S. Tanenbaum - Vrije Universiteit Amsterdam, The Netherlands, Albert S. Woodhull - Amherst, ... Basic Memory Management Section 4. 2. Swapping Section 4. 3. Virtual Memory Section 4. 4. Page Replacement Algorithms Section 4. 5. Design Issues for Pagi...

Ngày tải lên: 12/08/2014, 22:21

... kernel starts the system and clock tasks, and then the process manager and the file system. The process manager and the file system then cooperate in starting other servers and drivers that are part ... interactive systems, especially timesharing systems and servers, different goals apply. The most important one is to minimize response time, that is the time between issuing a c...

Ngày tải lên: 12/08/2014, 22:21

... (lines 8383 to 841 8), is initialized by the compiler with the addresses of the routines that handle exceptions and hardware interrupts and then is used in the loop at lines 846 4 to 846 8 to initialize ... C programs and the rather ugly forms these data take in the machine readable descriptors such as the one in Fig. 2 -44 . Init_codeseg (line 847 7) and init_dataseg (line 849 3) are...

Ngày tải lên: 12/08/2014, 22:21

... http://www.simpopdf.com [Page 40 4] 4. 5. Design Issues for Paging Systems In the previous sections we have explained how paging works and have given a few of the basic page replacement algorithms and shown how ... form of a clock, as shown in Fig. 4- 15. A hand points to the oldest page. Figure 4- 15. The clock page replacement algorithm. [View full size image] 4 4 Simpo PDF Me...

Ngày tải lên: 12/08/2014, 22:21

... drivers and servers of MINIX 3 need support for communication with the kernel that is not necessary in monolithic operating systems. Fig. 4- 52 shows these calls and their purposes. [Page 47 2] Figure ... 47 1] 4. 8.7. Implementation of Other System Calls The process manager handles three system calls that involve time in time.c: time, stime, and times. They are summarized in Fig...

Ngày tải lên: 12/08/2014, 22:21

... (lines 248 19 and 248 20). Once this test has been passed, new_node is called. If new_node succeeds, then the directory entries for "." and " " are made (lines 248 41 and 248 42). ... uses of the open call and is really only necessary for compatibility with older programs. The procedures that handle creat and open are do_creat (line 245 37) and do_open (line 2...

Ngày tải lên: 12/08/2014, 22:21

... r_buf[RANDOM_ELEMENTS]; /* buffer for random info */ 049 42 } bin[RANDOM_SOURCES]; 049 43 }; 049 44 049 45 #if (CHIP == INTEL) 049 46 typedef unsigned reg_t; /* machine register */ 049 47 049 48 /* The stack frame layout ... 0 640 0 .define _hwint09 0 640 1 .define _hwint10 0 640 2 .define _hwint11 0 640 3 .define _hwint12 0 640 4 .define _hwint13 0 640 5 .define _hwint 14 0 640 6 .define _...

Ngày tải lên: 12/08/2014, 22:21

... (OPOST|XTABS)) 148 40 == (OPOST|XTABS)) { 148 41 /* Tabs must be expanded. */ 148 42 if (oct >= tablen) { 148 43 pos += tablen; 148 44 ict ; 148 45 oct -= tablen; 148 46 do { 148 47 *bpos = ' '; 148 48 if ... >> IN_LSHIFT; 147 37 while (len > 0) { 147 38 rawecho(tp, '\b'); 147 39 rawecho(tp, ' '); 147 40 rawecho(tp, '\b'); 147 41 len ; 147...

Ngày tải lên: 12/08/2014, 22:21

... advanced parallel, distributed, and imaging systems. In the past, he has done research on compilers, operating systems, networking, and local-area distributed systems. His current research focuses ... in operating systems, networks, and large wide-area distributed systems. Together, all these research projects have led to over 100 refereed papers in journals and conference...

Ngày tải lên: 12/08/2014, 22:21